Trouble in paradise? Vishnu/FFtec N54 335ii Single Turbo kits experiencing issues as a BimmerBoost member runs 12.5@121 with misfires and having to short shift

Trouble in paradise? Vishnu/FFtec N54 335ii Single Turbo kits experiencing issues as a BimmerBoost member runs 12.5@121 with misfires and having to short shift

If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

Trouble in paradise? Vishnu/FFtec N54 335ii Single Turbo kits experiencing issues as a BimmerBoost member runs 12.5@121 with misfires and having to short shift

BimmerBoost would like to thank member GeorgiaTech335Coupe for his openness and honesty regarding his Vishnu/FFTEC single turbo setup. Recently, this member took his single turbo upgraded 6-speed manual 335i to the PBIR (Palm Beach International Raceway) dragstrip in Florida to do some testing. His best run was a 12.50@121.6 alongside a 12.8@117. Yes, these times are quite a ways away from the 10.8@131 glory pass from Vishnu demonstrating the kits capability.

This is in no way the fault of GeorgiaTech335Coupe who experienced misfires on his car and had to short shift at 6300 rpm in order to avoid them. Now, Vishnu has basically portrayed this kit as perfect and ready for sale with nobody having any issues. The reason BimmerBoost is bringing this issue to the attention of the community is for potential buyers to understand what they are getting into.

There is absolutely nothing wrong with having issues when modifying a car to this level and BimmerBoost is confident Vishnu will resolve them. There is something wrong with pretending nothing is wrong. A few cars with the single turbo kits have gone up for sale and apparently a total of three people, that are willing to open their mouths, are having misfire issues with these kits.

These issues will no doubt get resolved but potential buyers and current customers needs to be aware of the process, effort, and that progress is being made. Pretending nothing is wrong and collecting money simply is the wrong way to go about this and once again (it's becoming a trend) BimmerBoost is the only site bringing these issues to the attention of the community.

For the record, a member by the name of @tmo335tt says he has a hardware solution for the misfires that he will likely share with Vishnu (hopefully not for free). Interesting that it isn't Vishnu but the community solving this.

Thanks again to @GeorgiaTech335Coupe for sharing his details, good or bad, as we all learn thanks to honesty and openness. There is more to tuning than just collecting money.

Hopefully people realize Vbox times are not track times. Hotrod used to do that nonsense and it was hilarious to watch him claim records based on inflated Vbox BS.

At my track here in Orlando, my VBOX would always be dead on with my slip. Not at PBIR though. I'm not sure if my VBOX is out of calibration or if the track is. Unfortunately, I forgot to ask my friend to check his VBOX against his slips so I dont' have a 2nd point of reference.

I'll probably go to Bradenton's track soon. I'll check my VBOX against the slips there and see if my VBOX is messed up or if PBIR is.

At my track here in Orlando, my VBOX would always be dead on with my slip. Not at PBIR though. I'm not sure if my VBOX is out of calibration or if the track is. Unfortunately, I forgot to ask my friend to check his VBOX against his slips so I dont' have a 2nd point of reference.

I'll probably go to Bradenton's track soon. I'll check my VBOX against the slips there and see if my VBOX is messed up or if PBIR is.

It will likely vary based on location, elevation, conditions. The point ultimately being a Vbox isn't equal to a slip.

Pretty close, but what's disturbing is his 1/8mi ET. It's not good. I would think even after the bad 60' he should pick up more time on the front end.

its not just the ET, its the mph.. and its consistant with a lot of other cars. I guess the key really is gearing for thating because it just lacks the power down low. Id really love for the optimum setup to be found and replicated

its not just the ET, its the mph.. and its consistant with a lot of other cars. I guess the key really is gearing for thating because it just lacks the power down low. Id really love for the optimum setup to be found and replicated

He is shifting fine and the gearing looks alright. He definitely needs NLS big time though, which also means he needs flatline fix. The spool looks not so good on this kit.

Having a big single with lots of lag, it is very hard to launch. Your 2 step has to be dialed in and you really have to know how to use it. I know for me though, once this thing takes off, hold on especially NLS. It's in boost the whole rest of the trip. I'm AWD though. I can't imagine how difficult it is to launch that car with 6MT with that much HP and that much lag and RWD. My best 60' time with my 335i was 1.8 which is pretty good but the track and prep are amazing there and I had stock twins with no lag and I was NLS.

Originally Posted by rudypoochris

He is shifting fine and the gearing looks alright. He definitely needs NLS big time though, which also means he needs flatline fix. The spool looks not so good on this kit.

sorry, not following the statement, you know you can change gears right..?

2 gear changes in an MT adds significant time compared to the 1 shift usually done in a 6MT stock turbo car. That said, I'd be very surprised if he didn't have full boost well before or at 3800 RPM if he brake boosted the car and started it in the 45-50mph range. Shiv showed a video of his car making 1 bar around 3100ish RPM, which is what I would expect given the engine in question and the turbo used, so I'd be surprised if he really needed to start the car in 2nd for a good time.

So track wasn't what I had hoped for. I had a couple issues (timing would zero out in 4th if I used NLS or if I shifted too quickly). Ran a little bit of race gas so I could hot lap (got there late, 1:30), but left the boost level at what I daily drive at ~23-24psi to get a feel of what it could do in the street setup.

Bottom line:
I ran 12.0x at 124.89 mph.

Needless to say I was disappointed. I think a big factor in this is my gearing. 4th gear is just too long. At 125mph, 4th gear is under 6000rpm. I think I see a 3.46 rear end with LSD in the very near future.

My drag radials are very, very bald so that made it tough to get out the hole. I have new ones coming in Thursday. I'm also going to get a dedicated wheel setup for the strip eventually.

I'm not sure how others were running. My friend who has a 730whp 2013 GT500 was trapping around ~129mph. He was happy he finally broke 10s though.

Last, my VBOX was reading usually 0.3s slower than my slip. On one of my 12.0x runs, it read 12.2. MPH was just about always 1mph faster (expected). I really think the timing blocks at PBIR are not setup correctly. My 60' times seem a lot better than how they feel from experience...and I have done probably 400 passes in this car. I datalogged all my runs, I'll post up some of those as well as the slips. I wrote the VBOX time and mph on each slip as well so I wouldn't forget the discrepancy. Unfortunately, I couldn't confirm with someone else who had a VBOX if there's was showing the same discrepancies as mine. Maybe my VBOX could be wrong? I don't know, but if I had to guess I'd say it wasn't and that PBIR has inflated times (or deflated? cause they are lower?).

Hey man, glad you went. Its not easy getting great times at the strip and I'll say this much, unless you're ready to start breaking some things and living through considerable 6MT related frustrations of drag racing (launches specifically) I'd honestly say to just drop it unless you're truly enjoying it. I'd try to get a couple 60-130 runs and just enjoy the car. Don't let the 1/4 times bog you down. We've all seen 6MT cars that have mid-high 11s in them on stock turbos running mid-high 12s due to just inability so launch really well and shift fast or shift at the right time. There's a ton of things and attention to detail that go into 6MT drag racing this car. Its NOT easy, 6AT cars make it LOOK easy.

This car will have a MONSTER record with a big turbo(s) once a DCT car hits the track WITH upgraded clutch packs and hopefully tranny reflashed. I suspect very very deep in the 10s easily

Exactly... IHRA sanctioned track equipment is going to be more trustworthy than a box in the car.

VBOX has been proven to be very accurate. It's just a very accurate GPS that constantly records position and calculates speed/acceleration.

IHRA sanctioned track equipment still has to be placed correctly to work properly. They just use beams that are broken and record time between each beam break and calculate speed. Think of what would happen if those blocks were placed a couple feet short.

its not just the ET, its the mph.. and its consistant with a lot of other cars. I guess the key really is gearing for thating because it just lacks the power down low. Id really love for the optimum setup to be found and replicated

Exactly. I'm not too concerned with ET at this point as my tires aren't setup for a great ET. I'm sure that is robbing me of some mph too as it is very hard not to spin all the way through first. Gearing is playing a big role in 3rd and 4th gear, especially 4th.